The 707 area code is expected to be depleted of available prefixes by December 2023. On June 23, 2022, the CPUC acted to ensure that phone numbers continue to be available to meet the demand in the geographic region served by the 707 area code. The CPUC issued Decision 22-06-031 and approved a second area code (called an overlay) that will provide additional numbering resources for the 707 area code geographic region. The new area code to overlay the 707 area code is the 369 area code. The overlay will be effective beginning February 1, 2023. New customers will be assigned telephone numbers from the new 369 area code after all available prefixes in the 707 area code have been depleted.

Additional information:


The 707 area code was created in 1959 when it split off the 415 area code. The 707 area code serves portions of Del Norte, Glenn, Humboldt, Lake, Marin, Mendocino, Napa, Solano, Sonoma, Tehama and Trinity Counties. The 707 area code serves the cities of American Canyon, Arcata, Benicia, Calistoga, Clearlake, Cloverdale, Cotati, Crescent City, Dixon, Eureka, Fairfield, Ferndale, Fort Bragg, Healdsburg, Lakeport, Napa, Novato, Petaluma, Point Arena, Rio Dell, Rio Vista, Rohnert Park, Saint Helena, Santa Rosa, Sebastopol, Sonoma, Suisun City, Trinidad, Ukiah, Vacaville, Vallejo, Windsor, Willits, and Yountville, as well as unincorporated communities.


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